Adjustable window jack



Aug. 7, 1928. 1,679,961

E. L. EMBREY ADJUSTABLE WINDOW JACK Filed Dec. 20. 192'? 2 Sheets-Sheet 1 Inventor E Z. 27 67 43' Aug. 7, 1928.

E. L. EMBRE ADJUSTABLE WINDOW JACK FiIed Dec. 20, 1927 2 Sheets-Sheet Attarrzqy Patented Aug. 7, 1928.

EDWIN LuEMBREY, OF SPRINGFIELD, MISSOURI.

ADJUSTABLE WINDOW JACK.

Application filed December 20, 1927. Serial No. 241,359,

The present invention relates to improvements in scaflolds and has reference more particularly to an adjustable window ack.

One or the important objects oi the present invention is to provide a window jack which can be readily and easily set up in position for use to permit a person to be properly seated outside of a window to facilitate cleaning oi the window, and this in a safe manner.

A further object of the invention is to provide a window jack that is capable of adjustment in order to permit the use of the same with window 'lranies of various widths, said window jack further including main sill engaging "feet that are slidably adjusted on the spaced bars that extend outwardly through the window, auxiliary vertically adjustable teet being carried by said bars for engagement with the sub-sill to maintain the jack in a proper horizontal position when the seat board secured on the outer ends of the bars is occupied.

A further object is to provide an adjustable window jack of the above mentioned character which is simple in construction, inexpensive to manufacture, strong and durable, easy to manipulate, compact and con-. venient in its arrangement, thoroughly eflicient and reliable in its operation, and otherwise well adapted to the purpose for which it is designed. i

In the accompanying drawings, forming a part of this spccificatiomand in which like numerals indicate like parts throughout the same:

' feet that engages the sub-sill, and

Figure 6 is a sectionalview taken substantially on the line 6-6 of Figure 3.

In the drawings for the purpose of illustration is shown the girelferred embodiment oi? my invention, the numeral 1 designates generally my improved window jack, the same comprising the elongated parallel spaced longitudinal bars 2 and 8 respec- Figure 1 is a top plan view of the adjust-.

jack with respect to a tivelyu ,A. seat board -it extends across the outer ends of the spaced bars and is secured to the upper edges thereof in any appropriate manner.

A window it'ralne engaging bar 5 extends transversely across the upper edges of the inner ends of the longitralinalbars 2 and 3 and secured thereto by the bolts 6, the

ends oi this cross bar extending beyond the sides of the longitudinal bars in the manner as clearly illustrated in Figure l. v Substantially rectangular shaped brackets that are formed from flat strips of metal and denoted by the numeral '7 in the drawing are secured on the upper edges of the .innelflends oil. the lougitiujlinal. bars 2 and 3 and theinner-taco oi the cross bar 5 is disposed against the inner side of the respective rectangular shaped. brackets in a manner as clearly illus trated. in Figure 3, the bolts (3 extending through the top and bottom sides of the bracket as also clearly shown. in this particular figure of the drawings. The outer iiace of the cross bar 5 is spaced from the ad jacent side of the respective bracket and the purpose thereof will be presentl; apparent. Additional rectangular shaped brackets 8 are carried by the respectiveends of the cross bar 5 and the outer side 'l ace oi the cross bar is also spaced from the outer side oi? the 'end brackets.

Extension bars 9 are slidably associated with the outer ends oi the stationary cross bar 5 and these extension bars are slidable within. the outer portions of the respective pairs of rectangular brackets 7 and 8. A pin 1.0 project s laterally from the intern'iediate portion. of the outer side of each oil? the. extension bars and. engages therespectivc outer bracket 8 for limiting the outward sliding moven'ient oi? saidjcxtension bars and thereby preventing the same from becoming disengaged with respect to the stationary main cross bar. The purpose of these extension. bars is to provide a means whereby a window jack may be used in conjunction with window frames of various widths. These extension bars are slidable between the outer side face of the cross barb and the adjacent side oi. the brackets.

Also forming a salient part of the present invention. are the niain s'ill engaging 'i't'eet that are associated .with. the longitudinal bars 2 and Each ofthese teet comprises a substantially inverted U-shaped yoke 11 that straddles each of the longitudinal bars.

, central portion ofthe block for securing the same in position within the housing, a nut being threaded on the threaded end of the bolt in the manner as shown very clearly in Figure "6. The' l'ower end portion of the block projects beyond the lower open end of the housing formed for the block while the upper edge of the block engages the lower edge of a respective longitudinal bar in such a manner as to permit the free shdm movement of the feet along the bars.

The lower end or bottom face of each block is preferably beveled in order to permit the same to properly engage the main sill B as shown in Figure 3.

For the purpose of adjusting each of the slidable feet so that the inner sides of the yoke member will engage the forward edge portion of the subsill C, I provide a chain 16 for each of the feet, one end of the chain I being secured t'o an eye member 17 that is arranged on one side of the yoke 11, the intermedi'ate portion of the chain being adapted to .extend through a suitable loop 18 forme at the outer lower corner of the respective rectangular shaped bracket 7. The

' free end of each chain i'sadapte-d to be sec'iii'e'd to a hook 19 that is arranged on'the opposite side of the yoke and any one of the links of the free end. portion of the chain may be engaged with the respective hook.

A 'retractile coil'spring 20 is connected one end "to the outer side portion of the block 13'as at 21 with reference more particularly to Figure 4, the other end of the spring being secured to the lower edge of the adjacent longitudinal bar outwardly of the yoke and this spring normally urges the ge'spec'tiv'e slidable hook outwardly along its an The invention further comprehends the provision of 'subsill engaging feet and to this end, there provided a pair of auxiliary feet such as are shown at 22 with reference more particularly to Figure 5. Each of the auxiliary feet comprises a flat strip of metal that includes a vertical portion 23 and a laterally extending lower end portion 24.

r The vertical portion 23 is provided with a of each longitudinal bar and through the vides means whereby each of the auxiliary feet may be properly adjusted in order to permit the window jack to rest in a horizontal position when in use and when the cross bar 5 or its extension 5) engages the inner face of the window frame A, and the. outer ends of the longitudinal bars are disposed beyond the outer side of the window, the jack will be properly supported so that a person may occupy the seat board 1- and wash the windows on the outside in a safe manner.

A window jack of the above mentioned character may be easily and readily adjusted and be properly positioned within the window andv the sill engaging feet will cooperate with the window frame engaging L'I'Oss bar to maintain the jack in a horizontal position. when the jack is in use. The sim plicity of my improved jack enables the same. to be constructed at a very low cost and by reason of the extensible bars that are associated with the main cross bar, the jack may be used with windows of various widths.

lVhile I have shown the preferred clubodiment of my invention, it is to be understood that various changes in the size, shape and arrangement of parts may be resorted to. without departing from the spirit of the invention and the scope of the appended claim.

Having thus described my invention, what I claim as new is:

In a window jack of the class described, a pair of spaced longitudinal bars. the outer ends thereof adapted to extend out 'ardly ot awindow frame, a scat board arrangml across the outer ends of the bars, an adjustable cross member secured on the inner ends of the bars and adapted to engage the inner face of the window frame, main sill engaging feet carried by the longitudinal bars, and means for holding said feet against the outer edge of the subsill of the window. said last mentioned means comprising a llcxiblc element secured at one end to one side of each foot, alooped member at the inner end of each longitudinal bar through which the intermediate portion of the respective tlexible member ewtends, the free end of the tle.xi ble member being adjust-ably secured to the other side of the respective l'oot.

In testimony whereof I atlix my signature.

EDWIN L. EMBRICY. 

